SOYO SY-P4I845PE - Manual (Page 38)

Hardware Installation SY-P4I845PE
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prompt to load the BIOS optimal setup.
Step3.
Select [SOYO COMBO FEATURE]
Do this step if you want to change or overclock the CPU FSB.
Set the [CPU Frequency Select] field to “Manual”, to be able to change the
CPU frequency 1 MHz stepping.
Step4.
Select [SAVE & EXIT SETUP]
Press <Enter> to save the new configuration to the CMOS memory, and
continue the boot sequence.